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annotate cdd_fader.c @ 2496:187bc857a76a default tip

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Fix bug in MED mapper protection bit implementation
author Michael Pavone <pavone@retrodev.com>
date Sun, 28 Apr 2024 23:33:11 -0700
parents 9ead0fe69d9b
children
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1 #include "cdd_fader.h"
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2 #include <stdio.h>
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3 #define CDDA_MCLKS 16934400
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4
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5 void cdd_fader_init(cdd_fader *fader)
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6 {
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7 fader->audio = render_audio_source("CDDA", CDDA_MCLKS, 384, 2);
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8 fader->cur_attenuation = 0x4000;
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9 fader->dst_attenuation = 0x4000;
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10 fader->attenuation_step = 0;
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11 }
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12
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13 void cdd_fader_deinit(cdd_fader *fader)
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14 {
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15 render_free_source(fader->audio);
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16 }
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17
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18 void cdd_fader_set_speed_percent(cdd_fader *fader, uint32_t percent)
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19 {
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20 uint32_t new_clock = ((uint64_t)CDDA_MCLKS * (uint64_t)percent) / 100;
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21 render_audio_adjust_clock(fader->audio, new_clock, 384);
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22 }
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23
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24 void cdd_fader_attenuation_write(cdd_fader *fader, uint16_t attenuation)
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25 {
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26 fader->dst_attenuation = attenuation & 0xFFF0;
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27 fader->flags = attenuation & 0xE;
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28 if (fader->dst_attenuation > fader->cur_attenuation) {
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29 fader->attenuation_step = (fader->dst_attenuation - fader->cur_attenuation) >> 4;
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30 } else if (fader->dst_attenuation < fader->cur_attenuation) {
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31 fader->attenuation_step = (fader->cur_attenuation - fader->dst_attenuation) >> 4;
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32 } else {
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33 fader->attenuation_step = 0;
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34 }
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35 }
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36
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37 void cdd_fader_data(cdd_fader *fader, uint8_t byte)
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38 {
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39 fader->bytes[fader->byte_counter++] = byte;
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40 if (fader->byte_counter == sizeof(fader->bytes)) {
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41 fader->byte_counter = 0;
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42 int32_t left = (fader->bytes[1] << 8) | fader->bytes[0];
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43 int32_t right = (fader->bytes[3] << 8) | fader->bytes[2];
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44 if (left & 0x8000) {
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45 left |= 0xFFFF0000;
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46 }
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47 if (right & 0x8000) {
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48 right |= 0xFFFF0000;
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49 }
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50 if (!fader->cur_attenuation) {
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51 left = right = 0;
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52 } else if (fader->cur_attenuation >= 4) {
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53 left *= fader->cur_attenuation & 0x7FF0;
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54 right *= fader->cur_attenuation & 0x7FF0;
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55 left >>= 14;
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56 right >>= 14;
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57 } else {
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58 //TODO: FIXME
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59 left = right = 0;
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60 }
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61 render_put_stereo_sample(fader->audio, left, right);
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62 if (fader->attenuation_step) {
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63 if (fader->dst_attenuation > fader->cur_attenuation) {
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64 fader->cur_attenuation += fader->attenuation_step;
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65 if (fader->cur_attenuation >= fader->dst_attenuation) {
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66 fader->cur_attenuation = fader->dst_attenuation;
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67 fader->attenuation_step = 0;
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68 }
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69 } else {
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70 fader->cur_attenuation -= fader->attenuation_step;
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71 if (fader->cur_attenuation <= fader->dst_attenuation) {
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72 fader->cur_attenuation = fader->dst_attenuation;
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73 fader->attenuation_step = 0;
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74 }
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75 }
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76 }
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77 }
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78 }
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79
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80 void cdd_fader_serialize(cdd_fader *fader, serialize_buffer *buf)
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81 {
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82 save_int16(buf, fader->cur_attenuation);
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83 save_int16(buf, fader->dst_attenuation);
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84 save_int16(buf, fader->attenuation_step);
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85 save_int8(buf, fader->flags);
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86 save_buffer8(buf, fader->bytes, sizeof(fader->bytes));
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87 save_int8(buf, fader->byte_counter);
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88 }
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89
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90 void cdd_fader_deserialize(deserialize_buffer *buf, void *vfader)
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91 {
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92 cdd_fader *fader = vfader;
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93 fader->cur_attenuation = load_int16(buf);
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94 fader->dst_attenuation = load_int16(buf);
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95 fader->attenuation_step = load_int16(buf);
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96 fader->flags = load_int8(buf);
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97 load_buffer8(buf, fader->bytes, sizeof(fader->bytes));
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98 fader->byte_counter = load_int8(buf);
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99 }